Significant Accounting Policies (Tables)

3 Months Ended

Aug. 31, 2016

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	August 31, 2016		May 31, 2016
Raw materials	$	871,000	$	942,000
Work in progress		681,000		690,000
Finished products		299,000		231,000
Total	$	1,851,000	$	1,863,000

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

		Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2016	1,199,000	$	0.81
Granted	55,000		1.55
Forfeited	(5,000)		0.96
Outstanding  August 31, 2016	1,249,000	$	0.84

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended August 31,
	2016		2015
Numerator:
Loss from continuing operations	$	(55,417)	$	(72,335)
Denominator for basic net loss Per common share		8,169,673		7,582,056
Effect of dilutive securities:
Options		--		--
Denominator for diluted net loss per common share		8,169,673		7,582,056
Basic net loss per common share	$	(0.01)	$	(0.01)
Diluted net loss per common share	$	(0.01)	$	(0.01)